Syndiotactic vinylaromatic polymerization process using low hydrogen partial pressures
US5468818A · kind A · utility
2Cited by
3References
4Claims
0Family size
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Key dates
| Filing date | Mar 13, 1995 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Mar 13, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/905
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing syndiotactic polymers of vinylaromatic monomers comprising contacting one or more vinylaromatic monomers with a catalyst system comprising a pentamethylcyclopentadienyltitanium based metal complex capable of preparing syndiotactic vinylaromatic polymers under coordination polymerization conditions in the presence of hydrogen gas at a hydrogen partial pressure from 10 to 45 kPa and maintaining said partial pressure of hydrogen continuously throughout the polymerization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.